微种植体支抗远移上颌磨牙的临床研究

CLINICAL STUDY OF DISTALIZING UPPER MOLARS BY MICRO-IMPLANT

目的观察微种植体远移上颌磨牙的作用及效果。方法患者10例,均为安氏Ⅱ类错,下颌牙弓排列基本正常。共植入20枚微种植体于上颌颊侧牙槽骨内,将Ni-Ti螺旋推簧置于上颌第二前磨牙与上颌第一磨牙之间,推磨牙远移、测量上颌第一磨牙的移动距离和移动速度,在近远中方向、水平方向的位置变化及上切牙位置变化,并进行统计学分析。结果上颌第一磨牙平均移动距离5.4mm(p<0.01),平均移动速度(1.27±0.50)mm/月,平均远移时间为3～6个月;上颌中切牙平均舌侧移动2.3mm(p<0.05);上颌第一磨牙颊向移动距离及旋转角度无统计学意义。结论种植体在推上颌磨牙远移过程中,发挥了绝对强支抗作用,未见前牙支抗丢失,有效的远中整体移动上颌磨牙。

Objective To evaluate the clinical effects of distalizing upper molars by micro-implant in class Ⅱ case. Methods Ten patients presenting Class Ⅱ molar relationship. Twenty micro-implants were embedded in buccal alveolar, then Ni-Ti coil spring was set maxillary second premolar and maxillary first molar. This study had measured the changes in velocity, distance and position ofmaxillary first molar, which evaluated molar moving from, character to test anchorage intensity, All results were analyzed by statistics, Results The upper molars were distalized bodily on average 5, 4 mm in 3 - 6 months （p 〈0. 01 ）, Maxillary central incisor more 2. 3mm lingnally（p 〈 0.05 ）. The horizontal circumvolving angle and buccaUy moving of molar were of statistic significance, Conclusion During movement of maxillary molar, micro-implant was applied as strong anchorage with minimum anchorage loss,